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Commitments and Contingencies (Other Commitments and Contingencies) (Details) (USD $)
 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Public Service Company of New Mexico [Member]
Dec. 31, 2011
Public Service Company of New Mexico [Member]
Jun. 30, 2012
Public Service Company of New Mexico [Member]
Loss on Long-term Purchase Commitment [Member]
Jul. 31, 2012
Public Service Company of New Mexico [Member]
Transmissions Issues [Member]
Aug. 31, 2010
Public Service Company of New Mexico [Member]
Transmissions Issues [Member]
Jun. 30, 2012
Public Service Company of New Mexico [Member]
TGP Granada, LLC and its affiliate Complaint [Member]
Jun. 30, 2012
Public Service Company of New Mexico [Member]
Surface [Member]
Loss on Long-term Purchase Commitment [Member]
Jun. 30, 2011
Public Service Company of New Mexico [Member]
Surface [Member]
Loss on Long-term Purchase Commitment [Member]
Jun. 30, 2012
Public Service Company of New Mexico [Member]
Surface [Member]
Loss on Long-term Purchase Commitment [Member]
Jun. 30, 2011
Public Service Company of New Mexico [Member]
Surface [Member]
Loss on Long-term Purchase Commitment [Member]
Dec. 31, 2011
Public Service Company of New Mexico [Member]
Surface [Member]
Loss on Long-term Purchase Commitment [Member]
Jun. 30, 2012
Public Service Company of New Mexico [Member]
Underground [Member]
Loss on Long-term Purchase Commitment [Member]
Dec. 31, 2011
Public Service Company of New Mexico [Member]
Underground [Member]
Loss on Long-term Purchase Commitment [Member]
Jun. 30, 2012
Public Service Company of New Mexico [Member]
San Juan Generating Station [Member]
Jun. 30, 2012
Public Service Company of New Mexico [Member]
San Juan Generating Station [Member]
Coal Supply [Member]
Dec. 31, 2011
Public Service Company of New Mexico [Member]
San Juan Generating Station [Member]
Coal Supply [Member]
Jun. 30, 2012
Public Service Company of New Mexico [Member]
San Juan Generating Station [Member]
Underground [Member]
Loss on Long-term Purchase Commitment [Member]
Apr. 30, 2012
Public Service Company of New Mexico [Member]
San Juan Generating Station [Member]
Fuel and Purchased Power Adjustment Clause [Member]
Jun. 30, 2012
Public Service Company of New Mexico [Member]
San Juan Generating Station And Four Corners [Member]
Surface [Member]
Loss on Long-term Purchase Commitment [Member]
Apr. 30, 2010
Public Service Company of New Mexico [Member]
Palo Verde Nuclear Generating Station [Member]
Water Supply [Member]
Jun. 30, 2012
Public Service Company of New Mexico [Member]
Palo Verde Nuclear Generating Station [Member]
Nuclear Plant [Member]
Jun. 30, 2012
Public Service Company of New Mexico [Member]
Palo Verde Nuclear Generating Station [Member]
Nuclear Plant [Member]
Maximum [Member]
Jun. 30, 2012
Public Service Company of New Mexico [Member]
Palo Verde Nuclear Generating Station [Member]
Nuclear Plant [Member]
Commercial Providers [Member]
Jun. 30, 2012
Public Service Company of New Mexico [Member]
Palo Verde Nuclear Generating Station [Member]
Nuclear Plant [Member]
Industry Wide Retrospective Assessment Program [Member]
Jun. 30, 2012
Tortoise Capital Resources Corporation [Member]
TGP Granada, LLC and its affiliate Complaint [Member]
Loss Contingencies [Line Items]                                                      
Public Utilities, Inventories of previously mined coal available to supply the fuel requirements                               8 months 15 days                      
Other current assets $ 41,463,000 $ 33,397,000 $ 36,376,000 $ 26,776,000                         $ 13,000,000 $ 14,600,000                  
Loss Contingency, Estimate of Possible Loss                                     21,500,000   51,900,000            
Loss Contingency Accrual, Carrying Value, Payments                 900,000 1,300,000 2,300,000 2,600,000                              
Loss Contingency Accrual, at Carrying Value                 25,200,000   25,200,000   26,500,000 4,400,000 4,200,000                        
Public Utilities, Estimated Initial Funding Requirements         2,600,000                                            
Public Utilities, Estimated Initial Funding Requirements, Additional to be Funded         800,000                                            
Final Reclamation, capped amount to be collected                     100,000,000                                
Preliminary estimate increased deferral related to mine fire incident                                       17,300,000              
Public Utilities, Liability Insurance Coverage                                               12,600,000,000 375,000,000 12,200,000,000  
Public Utilities, Ownership Percentage in Nuclear Reactor                                             10.20%        
Public Utilities, Maximum Potential Assessment Per Incident                                             36,000,000        
Public Utilities, Annual Payment Limitation Related to Incident                                             5,400,000        
Public Utilities, Aggregate Amount of All Risk Insurance                                             2,750,000,000        
Public Utilities, Maximum Amount under Nuclear Electir Insurance Limited                                             4,300,000        
Litigation Settlement, Gross           $ 200,000 $ 200,000                                        
Public Utilities, Lease ownership percentage in EIP               60.00%                                     40.00%
Public Utilites, Option to renew portion of current EIP lease payments for maximum term to be calculated at end of initial lease term               50.00%                                      
Public Utilities, Signed an agreement with cities to provide cooling water essential to power production                                           40 years